1. When you define the library for your servers, do you point to the
        same device name, eg /dev/lmcp0 ?

        YES--BUT YOU CAN NAME THEM WHATEVER YOU WANT SINCE EACH SERVER TALKS
        TO THE 3494 THROUGH ITS OWN PORT.

     2. Are the tape drives shared dynamically as needed by each server or are
        they predefined and dedicated to a particular server?

        THEY ARE PREDIFINED AND DEDICATED TO A SERVER, BUT SINCE THEY HAVE TWO
        I/O PORTS THEY CAN BE ATTACHED TO BOTH SERVERS AT THE SAME TIME.
        (DEFINED ON ONE AND AVAILABLE ON THE OTHER)  WHEN YOU HAVE A NEED FOR
        MORE DRIVES ON A PARTICULAR SERVER YOU CAN EITHER RE-CABLE THEM OR
        MAKE THEM AVAILABLE USING SMIT.  YOU WILL HAVE TO MAKE SURE YOUR
        DEVICE CLASS IS SET UP FOR THE CORRECT AMOUNT OF TAPE DRIVES AS WELL.


     3. Are you using 'scratch' tapes with the library? If so, how do you
        manage them across the multiple servers? Are you using different
        'scratch and private' category codes for each different server?

        YES I AM USING SCRATCH TAPES AND ITS VERY IMPORTANT TO USE DIFFERENT
        SCRATCH AND PRIVATE CATEGORY CODES FOR EACH SERVER.  MAKE SURE THEY
        ARE DIFFERENT BEFORE STARTING THEM UP.  I DID THIS BY MAKING THE
        /DEV/LMCP0 UNAVAILABLE THEN I STARTED UP ADSM AND CHECK/DEFINED
        THE SCRATCH CODES.


    4.  How do you check them into the library?

        I WOULD CHECK THEM IN WITH THE FOLLOWING COMMAND:
        (assuming they are labeled)
        checkin libv libname volume devt=3590 status=scratch

    Hope this helps, if you have any further questions feel free to e-mail
    me or call.

    brian_pennington&aici.com
    (513)872-8746 work
    (513)872-1048 fax

________________________ Reply Separator _________________________________
Subject: Re: Multiple ADSM Servers
Author:  "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> at SMTP
Date:    1/8/97 6:03 PM


Brian,
Can you elaborate a little more on how you share the 3494 & its tape drives
among multiple servers? Specifically,
 1. When you define the library for your servers, do you point to the same
device name, eg /dev/lmcp0 ?
 2. Are the tape drives shared dynamically as needed by each server or are
they predefined and dedicated to a particular server?
 3. Are you using 'scratch' tapes with the library? If so, how do you
manage them across the multiple servers? Are you using different 'scratch
and private' category codes for each different server? How do you check
them into the library?
Thanks in advance for your help.

At 10:14 AM 1/8/97 EST, you wrote:
>     We are running multiple servers and sharing a 3494 with 4 3590s and
>     2 3490e cart drives.  We have had 4 3590's running on one scsi
>     controller with no problems.  We dont do this all the time but
>     if one server needs a couple extra drives we set them up on the
>     same controller.  Our servers are a sp wide node and a 58h.
>
>     hope this helps
>
>     Brian
>
>     Brian_Pennington AT aici DOT com
>
>
>______________________________ Reply Separator
_________________________________
>Subject: Multiple ADSM Servers
>Author:  "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> at SMTP
>Date:    1/8/97 6:54 AM
>
>
>Has anybody ever run multiple AIX ADSM servers all working with one 3494?
>We're running the server on an SP wide node and have managed to shoehorn 4
>SCSI controllers in for the 3590 drives in the library. We've still got
>more client machines to migrate to ADSM and some of them have large volumes
>of data to backup so 2 more 3590s have arrived. Problem is we know from
>past experience that its just not worth putting more than one 3590 on a
>SCSI controller.
>
>The only answer we can come up with is to run a second ADSM server on
>another node with adequate MCA slots free for the SCSI connections to, say,
>the two new 3590s in the library and start putting clients onto this one.
>This will bring more administration overheads for us and some possible
>areas of confusion. Can anyone see any other problem areas running these
>two ADSM servers against a single 3494, containing 6 3590 drives, two of
>which are managed by one server, four by the other?
>
>We're doing what we can to minimise tape drive contention but contention
>does exist and hence the need for more drives. Anyone any experience of
>running ADSM on a high-node? These have 16 MCA slots and would allow us to
>continue with one ADSM server but we've heard that the high-speed switch
>code doesn't perform well on an SMP machine.
>
>Thanks in advance
>Alan White
>
>

Have a nice day or whatever's left of it.

David Ong
National Semiconductor Corp.